.header{
  position: fixed;
  top: 0;
  left: 0;
  z-index: 2;
  width: 100%;
  height: .44rem;
  background-color: #f40;
  color:#fff;
  text-align: center;
  font-size: .16rem;
  line-height: .44rem;

  .back-icon{
    display: flex;
    justify-content: center;
    align-items: center;
    position: absolute;
    top: 0;
    left: 0;
    width: .44rem;
    height: .44rem;

    .iconfont{
      color: #fff;
    }
  }
}